Chongqing: The "u" section was reportedly used for mushroom cultivation, so it has never been opened. However, due to the development of low-altitude economy, there are plans to reclaim it. Apparently, a portion of the "v" section will also be reclaimed.
Dalian: I'm not sure if this applies to all of Liaoning, but when I was in Dalian, it was mandatory to have the 'V' segment approved.